package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    //统计一段时间内的营业额数据
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {

        //当前集合用于存饭从begin到end的每天的日期
        List<LocalDate> dateList=new ArrayList<>();
        dateList.add(begin);
        while (! begin.equals(end)){
            //日期计算,计算指定日期的后一天日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的营业额数据
        List<Double> turnoverList=new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额数据,营业额是指状态为已完成的订单的总金额
            LocalDateTime beginTime=LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime=LocalDateTime.of(date,LocalTime.MAX);

            //根据条件查询表单,把条件封装到map集合当中
            Map map=new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover=orderMapper.sumByMap(map);
            turnover=turnover==null?0.0:turnover;
            turnoverList.add(turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    //统计指定时间区间内的用户数量
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {

        //存放从begin到end之间每天对应的日期
        List<LocalDate> dateList=new ArrayList<>();
        dateList.add(begin);
        while (! begin.equals(end)){
            //日期计算,计算指定日期的后一天日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的新增用户数量
        List<Integer> newUserList=new ArrayList<>();
        //存放每天的总用户数量
        List<Integer> totalUserList=new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime=LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime=LocalDateTime.of(date,LocalTime.MAX);
            Map map=new HashMap();
            map.put("end",endTime);
            //总的用户数量
            Integer totalUser=userMapper.countByMap(map);

            map.put("begin",beginTime);
            //新增用户数量
            Integer newUser=userMapper.countByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        //封装结果数据
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    //统计指定时间区间内的订单数据
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end之间每天对应的日期
        List<LocalDate> dateList=new ArrayList<>();
        dateList.add(begin);
        while (! begin.equals(end)){
            //日期计算,计算指定日期的后一天日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的订单数量
        List<Integer> validOrderCountList=new ArrayList<>();
        //存放每天的订单有效数量
        List<Integer> orderCountList=new ArrayList<>();
        //遍历dateList集合,获取每天的有效订单数和订单总数
        for (LocalDate date : dateList) {
            //查询每天订单总数
            LocalDateTime beginTime=LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime=LocalDateTime.of(date,LocalTime.MAX);
            Integer orderCount=getOrderCount(beginTime,endTime,null);

            //查询每天有效订单数
            Integer validOrderCount=getOrderCount(beginTime,endTime,Orders.COMPLETED);
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间区间内的订单总数和有效订单数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();


        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if(totalOrderCount!=0){
            //计算订单完成率
            orderCompletionRate=validOrderCount.doubleValue()/totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }


    //一个方法
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }

    //统计指定时间区间内的销量排名top10
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime=LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime=LocalDateTime.of(end,LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop(beginTime,endTime);
        List<String> names=salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList=StringUtils.join(names,",");

        List<Integer> numbers=salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList=StringUtils.join(numbers,",");


        //封装返回结果数据
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    //导出运营数据报表
    @Override
    public void exportBusinessData(HttpServletResponse response) {

        //1.查询数据库获取营业数据--查询最近30天的营业数据
        LocalDate dateBegin=LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        //查讯概览数据
        BusinessDataVO businessDataVO=workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN),LocalDateTime.of(dateEnd,LocalTime.MAX));

        //2.通过POI将数据写入到Excel文件当中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/run.xlsx");

        try {
            //基于模版文件创建一个新的Excel文件
            XSSFWorkbook excel=new XSSFWorkbook(in);

            //获取表格文件的sheet页
            XSSFSheet sheet=excel.getSheet("sheet1");

            //填充数据--时间到第二行第二个单元格中
            sheet.getRow(1).getCell(1).setCellValue("时间:"+dateBegin+"至"+dateEnd);

            //获得第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());


            //填充明细数据
            for (int i=0;i<30;i++){
                LocalDate date=dateBegin.plusDays(i);
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
               row= sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(4).setCellValue(businessData.getUnitPrice());
                row.getCell(5).setCellValue(businessData.getNewUsers());
            }

            //通过输出流将Excel文件下载到客户端浏览器

            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }


    }
}
